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US 10,770,078 B2Granted
Adaptive gain-shape rate sharing
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorErik Norvell
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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorErik Norvell
Estimating the term…
An improved gain-shape vector quantization is achieved by determining a number of bits to be allocated to a gain adjustment- and shape-quantizer for a plurality of combinations of a current bit rate and a first signal property. The bit allocation is derived by using an average of optimal bit allocations for a training data set. A number of bits to the gain adjustment and the shape quantizers for a plurality of combinations of the bit rate and a first signal are pre-calculated, and a table indicating the number of bits to be allocated to the gain adjustment- and the shape-quantizers for a plurality of combinations of the bit rate and a first signal property is created. In this way, the table can be used for achieving an improved bit allocation.
A method in an encoder for allocating bits to a gain adjustment quantizer and a shape quantizer to be used for encoding a gain shape vector comprising a gain adjustment factor and a shape vector, the method comprising:
A method in a decoder for allocating bits to a gain adjustment dequantizer and a shape dequantizer to be used for decoding a gain shape vector comprising a gain adjustment factor and a shape vector, the method comprising:
An encoder for allocating bits to a gain adjustment quantizer and a shape quantizer to be used for encoding a gain shape vector, wherein the encoder comprises an adaptive bit sharing entity configured to determine a current bitrate and a signal bandwidth and to identify a bit allocation for the gain adjustment quantizer and the shape quantizer for the determined current bitrate and the signal bandwidth by using information mapping bit allocations to the gain adjustment quantizer and the shape quantizer based on bitrate and signal bandwidth, and a gain adjustment quantizer and a shape quantizer configured to apply the identified bit allocation when encoding the gain shape vector.
A decoder for allocating bits to a gain adjustment dequantizer and a shape dequantizer to be used for decoding a gain shape vector, the decoder comprises an adaptive bit sharing entity configured to determine a current bitrate and a signal bandwidth and to identify a bit allocation for the gain adjustment quantizer and the shape quantizer for the determined current bitrate and the signal bandwidth by using information mapping bit allocations to the gain adjustment quantizer and the shape quantizer based on bitrate and signal bandwidth, and a gain adjustment quantizer and a shape dequantizer configured to apply the identified bit allocation when decoding the gain shape vector.
Dependencies are inferred from the claim text.